Abstract
Cytokines dimerize their receptors, with the binding of the 'second chain' triggering signaling. In the interleukin (IL)-4 and IL-13 system, different cell types express varying numbers of alternative second receptor chains (γc or IL-13Rα1), forming functionally distinct type I or type II complexes. We manipulated the affinity and specificity of second chain recruitment by human IL-4. A type I receptor–selective IL-4 'superkine' with 3,700-fold higher affinity for γc was three- to ten-fold more potent than wild-type IL-4. Conversely, a variant with high affinity for IL-13Rα1 more potently activated cells expressing the type II receptor and induced differentiation of dendritic cells from monocytes, implicating the type II receptor in this process. Superkines showed signaling advantages on cells with lower second chain numbers. Comparative transcriptional analysis reveals that the superkines induce largely redundant gene expression profiles. Variable second chain numbers can be exploited to redirect cytokines toward distinct cell subsets and elicit new actions, potentially improving the selectivity of cytokine therapy.
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Acknowledgements
The authors thank J. Gregorio and K. Weiskopf for assistance and the Stanford Human Immune Monitoring Center. This work was supported by US National Institute of Allergy and Infectious Diseases Division of Intramural Research (I.S.J. and W.E.P.), the Finnish Medical Foundation, the Sigrid Juselius Foundation (I.S.J.), the Howard Hughes Medical Institute (K.C.G.), the US National Institutes of Health (NIH) RO1-AI51321 (K.C.G.) and NIH UO1-DK078123 (C.G.F.) and the Stanford Immunology Program Training Grant (D.L.B.).
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K.C.G. conceived the project, designed approaches for engineering of IL-4 and initiated subsequent cellular and functional experiments. D.L.B. and P.L. performed protein engineering and biophysical experiments. I.S.J., R.J.C., I.M. and W.E.P. designed and performed signaling experiments. R.J.C., M.M.-S. and I.M. performed transcriptional analysis and Luminex experiments. W.E.P., I.S.J. and M.M.S. performed mathematical modeling using Matlab. M.T.W., M.N.A., M.M.S. and I.M. performed dendritic cell experiments. I.S.J., R.J.C., I.M., D.L.B., C.G.F., P.J.U., W.E.P. and K.C.G. analyzed the data. P.J.U. and E.G.E. provided reagents and guidance for human primary cell experiments. I.S.J., R.J.C., I.M., W.E.P. and K.C.G. wrote the manuscript.
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Junttila, I., Creusot, R., Moraga, I. et al. Redirecting cell-type specific cytokine responses with engineered interleukin-4 superkines. Nat Chem Biol 8, 990–998 (2012). https://doi.org/10.1038/nchembio.1096
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DOI: https://doi.org/10.1038/nchembio.1096
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